Capítulo 5 — PISOS

Sección R503 — ENTABLADO DE PISO

2025 California Residential Code (Title 24, Part 2.5) · edición 2025 · actualizado 2026-07-07 · California

R503.1 Revestimiento de madera.

TABLA R503.1—ESPESOR MÍNIMO DEL REVESTIMIENTO DE MADERA PARA PISOS Col2 Col3
ESPACIADO DE VIGAS O TRAVESAÑOS
(pulgadas)
ESPESOR NETO MÍNIMO ESPESOR NETO MÍNIMO
ESPACIADO DE VIGAS O TRAVESAÑOS
(pulgadas)
Perpendicular a la viga Diagonal a la viga
24 11/16 3/4
16 5/8 5/8
48a 11/2 T & G N/A
54b 54b 54b
60c 60c 60c
Para SI: 1 pulgada = 25.4 mm, 1 libra por pulgada cuadrada = 6.895 kPa.
N/A = No Aplicable.
a. Para este espaciamiento de soporte, el revestimiento de madera deberá tener un Fb mínimo de 675 y un E mínimo de 1,100,000 (ver ANSI AWC NDS).
b. Para este espaciamiento de soporte, el revestimiento de madera deberá tener un Fb mínimo de 765 y un E mínimo de 1,400,000 (ver ANSI AWC NDS).
c. Para este espaciamiento de soporte, el revestimiento de madera deberá tener un Fb mínimo de 855 y un E mínimo de 1,700,000 (ver ANSI AWC NDS).
Para SI: 1 pulgada = 25.4 mm, 1 libra por pulgada cuadrada = 6.895 kPa.
N/A = No Aplicable.
a. Para este espaciamiento de soporte, el revestimiento de madera deberá tener un Fb mínimo de 675 y un E mínimo de 1,100,000 (ver ANSI AWC NDS).
b. Para este espaciamiento de soporte, el revestimiento de madera deberá tener un Fb mínimo de 765 y un E mínimo de 1,400,000 (ver ANSI AWC NDS).
c. Para este espaciamiento de soporte, el revestimiento de madera deberá tener un Fb mínimo de 855 y un E mínimo de 1,700,000 (ver ANSI AWC NDS).
Para SI: 1 pulgada = 25.4 mm, 1 libra por pulgada cuadrada = 6.895 kPa.
N/A = No Aplicable.
a. Para este espaciamiento de soporte, el revestimiento de madera deberá tener un Fb mínimo de 675 y un E mínimo de 1,100,000 (ver ANSI AWC NDS).
b. Para este espaciamiento de soporte, el revestimiento de madera deberá tener un Fb mínimo de 765 y un E mínimo de 1,400,000 (ver ANSI AWC NDS).
c. Para este espaciamiento de soporte, el revestimiento de madera deberá tener un Fb mínimo de 855 y un E mínimo de 1,700,000 (ver ANSI AWC NDS).

R503.1.1 Juntas finales. Las juntas finales en la madera utilizada como subpiso deberán ubicarse sobre los soportes, a menos que se utilice madera con juntas finales machihembradas, en cuyo caso cada pieza deberá apoyarse en no menos de dos vigas. Se permitirá omitir el subpiso cuando el espaciamiento de las vigas no exceda de 16 pulgadas (406 mm) y se aplique un piso de listones de madera nominal de 1 pulgada (25 mm) con machihembrado perpendicular a las vigas.

R503.2 Revestimiento con paneles estructurales de madera.

R503.2 Revestimiento de paneles estructurales de madera.

R503.2.1 Identificación y grado. El revestimiento de paneles estructurales de madera utilizado con fines estructurales deberá cumplir con CSA O325, CSA O437 DOC PS 1 o DOC PS 2. Los paneles deberán estar identificados por grado, clasificación de adhesivo y Categoría de Rendimiento mediante una marca de grado o un certificado de inspección emitido por una agencia aprobada. El valor de la Categoría de Rendimiento se utilizará como el “espesor nominal del panel” o “espesor del panel” dondequiera que se haga referencia en este código.

R503.2.1.1 Subsuelo y combinación de subsuelo con capa base. Cuando se utilicen como subsuelo o combinación de subsuelo con capa base, los paneles estructurales de madera deberán ser de uno de los grados especificados en la Tabla R503.2.1.1(1). Cuando se utilice madera contrachapada lijada como combinación de subsuelo con capa base, el grado, la clasificación de adhesivo y la Categoría de Rendimiento deberán ser los especificados en la Tabla R503.2.1.1(2).

5-12 2025 CÓDIGO RESIDENCIAL DE CALIFORNIA

el 18 de julio de 2025 11:14 AM (CDT) BAJO ELLO.

PISOS

TABLE R503.2.1.1(1)—ALLOWABLE SPANS AND LOADS FOR WOOD STRUCTURAL
PANELS FOR ROOF AND SUBFLOOR SHEATHING AND COMBINATION SUBFLOOR UNDERLAYMENTa, b, c
Col2 Col3 Col4 Col5 Col6 Col7 Col8 Col9
SPAN
RATING
MINIMUM
NOMINAL
PANEL
THICKNESS
(inch)
ALLOWABLE LIVE LOAD
(psf)h, I
ALLOWABLE LIVE LOAD
(psf)h, I
MAXIMUM SPAN
(inches)
MAXIMUM SPAN
(inches)
LOAD
(pounds per square foot,
at maximum span)
LOAD
(pounds per square foot,
at maximum span)
MAXIMUM SPAN
(inches)
SPAN
RATING
MINIMUM
NOMINAL
PANEL
THICKNESS
(inch)
Span
@ 16″ o.c.
Span
@ 24″ o.c.
With edge
supportd
Without edge
support
Total load Live load Live load
Sheathinge Sheathinge Rooff Rooff Rooff Rooff Subfloorj
16/0 3/8 30 16 16 40 30 0
20/0 3/8 50 20 20 40 30 0
24/0 3/8 100 30 24 20g 40 30 0
24/16 7/16 100 40 24 24 50 40 16
32/16 15/32, 1/2 180 70 32 28 40 30 16h
40/20 19/32, 5/8 305 130 40 32 40 30 20h, i
48/24 23/32, 3/4 175 48 36 45 35 24
60/32 7/8 305 60 48 45 35 32
Underlayment,
C-C plugged, single floore
Underlayment,
C-C plugged, single floore
Rooff Rooff Rooff Rooff Combination
subfloor
underlaymentk
16 o.c. 19/32, 5/8 100 40 24 24 50 40 16i
20 o.c. 19/32, 5/8 150 60 32 32 40 30 20i, j
24 o.c. 23/32, 3/4 240 100 48 36 35 25 24
32 o.c. 7/8 185 48 40 50 40 32
48 o.c. 13/32, 11/8 290 60 48 50 40 48
For SI: 1 inch = 25.4 mm, 1 pound per square foot = 0.0479 kPa.
a. The allowable total loads were determined using a dead load of 10 psf. If the dead load exceeds 10 psf, then the live load shall be reduced accordingly.
b. Panels continuous over two or more spans with long dimension (strength axis) perpendicular to supports. Spans shall be limited to values shown because of possible effect of
concentrated loads.
c. Applies to panels 24 inches or wider.
d. Lumber blocking, panel edge clips (one midway between each support, except two equally spaced between supports where span is 48 inches), tongue-and-groove panel
edges, or other approved type of edge support.
e. Includes Structural I panels in these grades.
f. Uniform load deflection limitation:1/180 of span under live load plus dead load,1/240 of span under live load only.
g. Maximum span 24 inches for15/32- and1/2-inch panels.
h. Maximum span 24 inches where3/4-inch wood finish flooring is installed at right angles to joists.
i. Maximum span 24 inches where 1.5 inches of lightweight concrete or approved cellular concrete is placed over the subfloor.
j. Unsupported edges shall have tongue-and-groove joints or shall be supported with blocking unless minimum nominal1/4-inch-thick wood panel-type underlayment, fiber-
cement underlayment with end and edge joints offset not less than 2 inches or 11/2 inches of lightweight concrete or approved cellular concrete is placed over the subfloor, or
3/4-inch wood finish flooring is installed at right angles to the supports. Fiber-cement underlayment shall comply with ASTM C1288 or ISO 8336 Category C. Allowable uniform
live load at maximum span, based on deflection of1/360 of span, is 100 psf.
k. Unsupported edges shall have tongue-and-groove joints or shall be supported by blocking unless nominal1/4-inch-thick wood panel-type underlayment, fiber-cement under-
layment with end and edge joints offset not less than 2 inches or3/4-inch wood finish flooring is installed at right angles to the supports. Fiber-cement underlayment shall
comply with ASTM C1288 or ISO 8336 Category C. Allowable uniform live load at maximum span, based on deflection of1/360 of span, is 100 psf, except panels with a span rating
of 48 on center are limited to 65 psf total uniform load at maximum span.
l. Allowable live load values at spans of 16 inches on center and 24 inches on center taken from referenced standard APA E30,APA Engineered Wood Construction Guide. Refer to
referenced standard for allowable spans not listed in the table.
For SI: 1 inch = 25.4 mm, 1 pound per square foot = 0.0479 kPa.
a. The allowable total loads were determined using a dead load of 10 psf. If the dead load exceeds 10 psf, then the live load shall be reduced accordingly.
b. Panels continuous over two or more spans with long dimension (strength axis) perpendicular to supports. Spans shall be limited to values shown because of possible effect of
concentrated loads.
c. Applies to panels 24 inches or wider.
d. Lumber blocking, panel edge clips (one midway between each support, except two equally spaced between supports where span is 48 inches), tongue-and-groove panel
edges, or other approved type of edge support.
e. Includes Structural I panels in these grades.
f. Uniform load deflection limitation:1/180 of span under live load plus dead load,1/240 of span under live load only.
g. Maximum span 24 inches for15/32- and1/2-inch panels.
h. Maximum span 24 inches where3/4-inch wood finish flooring is installed at right angles to joists.
i. Maximum span 24 inches where 1.5 inches of lightweight concrete or approved cellular concrete is placed over the subfloor.
j. Unsupported edges shall have tongue-and-groove joints or shall be supported with blocking unless minimum nominal1/4-inch-thick wood panel-type underlayment, fiber-
cement underlayment with end and edge joints offset not less than 2 inches or 11/2 inches of lightweight concrete or approved cellular concrete is placed over the subfloor, or
3/4-inch wood finish flooring is installed at right angles to the supports. Fiber-cement underlayment shall comply with ASTM C1288 or ISO 8336 Category C. Allowable uniform
live load at maximum span, based on deflection of1/360 of span, is 100 psf.
k. Unsupported edges shall have tongue-and-groove joints or shall be supported by blocking unless nominal1/4-inch-thick wood panel-type underlayment, fiber-cement under-
layment with end and edge joints offset not less than 2 inches or3/4-inch wood finish flooring is installed at right angles to the supports. Fiber-cement underlayment shall
comply with ASTM C1288 or ISO 8336 Category C. Allowable uniform live load at maximum span, based on deflection of1/360 of span, is 100 psf, except panels with a span rating
of 48 on center are limited to 65 psf total uniform load at maximum span.
l. Allowable live load values at spans of 16 inches on center and 24 inches on center taken from referenced standard APA E30,APA Engineered Wood Construction Guide. Refer to
referenced standard for allowable spans not listed in the table.
For SI: 1 inch = 25.4 mm, 1 pound per square foot = 0.0479 kPa.
a. The allowable total loads were determined using a dead load of 10 psf. If the dead load exceeds 10 psf, then the live load shall be reduced accordingly.
b. Panels continuous over two or more spans with long dimension (strength axis) perpendicular to supports. Spans shall be limited to values shown because of possible effect of
concentrated loads.
c. Applies to panels 24 inches or wider.
d. Lumber blocking, panel edge clips (one midway between each support, except two equally spaced between supports where span is 48 inches), tongue-and-groove panel
edges, or other approved type of edge support.
e. Includes Structural I panels in these grades.
f. Uniform load deflection limitation:1/180 of span under live load plus dead load,1/240 of span under live load only.
g. Maximum span 24 inches for15/32- and1/2-inch panels.
h. Maximum span 24 inches where3/4-inch wood finish flooring is installed at right angles to joists.
i. Maximum span 24 inches where 1.5 inches of lightweight concrete or approved cellular concrete is placed over the subfloor.
j. Unsupported edges shall have tongue-and-groove joints or shall be supported with blocking unless minimum nominal1/4-inch-thick wood panel-type underlayment, fiber-
cement underlayment with end and edge joints offset not less than 2 inches or 11/2 inches of lightweight concrete or approved cellular concrete is placed over the subfloor, or
3/4-inch wood finish flooring is installed at right angles to the supports. Fiber-cement underlayment shall comply with ASTM C1288 or ISO 8336 Category C. Allowable uniform
live load at maximum span, based on deflection of1/360 of span, is 100 psf.
k. Unsupported edges shall have tongue-and-groove joints or shall be supported by blocking unless nominal1/4-inch-thick wood panel-type underlayment, fiber-cement under-
layment with end and edge joints offset not less than 2 inches or3/4-inch wood finish flooring is installed at right angles to the supports. Fiber-cement underlayment shall
comply with ASTM C1288 or ISO 8336 Category C. Allowable uniform live load at maximum span, based on deflection of1/360 of span, is 100 psf, except panels with a span rating
of 48 on center are limited to 65 psf total uniform load at maximum span.
l. Allowable live load values at spans of 16 inches on center and 24 inches on center taken from referenced standard APA E30,APA Engineered Wood Construction Guide. Refer to
referenced standard for allowable spans not listed in the table.
For SI: 1 inch = 25.4 mm, 1 pound per square foot = 0.0479 kPa.
a. The allowable total loads were determined using a dead load of 10 psf. If the dead load exceeds 10 psf, then the live load shall be reduced accordingly.
b. Panels continuous over two or more spans with long dimension (strength axis) perpendicular to supports. Spans shall be limited to values shown because of possible effect of
concentrated loads.
c. Applies to panels 24 inches or wider.
d. Lumber blocking, panel edge clips (one midway between each support, except two equally spaced between supports where span is 48 inches), tongue-and-groove panel
edges, or other approved type of edge support.
e. Includes Structural I panels in these grades.
f. Uniform load deflection limitation:1/180 of span under live load plus dead load,1/240 of span under live load only.
g. Maximum span 24 inches for15/32- and1/2-inch panels.
h. Maximum span 24 inches where3/4-inch wood finish flooring is installed at right angles to joists.
i. Maximum span 24 inches where 1.5 inches of lightweight concrete or approved cellular concrete is placed over the subfloor.
j. Unsupported edges shall have tongue-and-groove joints or shall be supported with blocking unless minimum nominal1/4-inch-thick wood panel-type underlayment, fiber-
cement underlayment with end and edge joints offset not less than 2 inches or 11/2 inches of lightweight concrete or approved cellular concrete is placed over the subfloor, or
3/4-inch wood finish flooring is installed at right angles to the supports. Fiber-cement underlayment shall comply with ASTM C1288 or ISO 8336 Category C. Allowable uniform
live load at maximum span, based on deflection of1/360 of span, is 100 psf.
k. Unsupported edges shall have tongue-and-groove joints or shall be supported by blocking unless nominal1/4-inch-thick wood panel-type underlayment, fiber-cement under-
layment with end and edge joints offset not less than 2 inches or3/4-inch wood finish flooring is installed at right angles to the supports. Fiber-cement underlayment shall
comply with ASTM C1288 or ISO 8336 Category C. Allowable uniform live load at maximum span, based on deflection of1/360 of span, is 100 psf, except panels with a span rating
of 48 on center are limited to 65 psf total uniform load at maximum span.
l. Allowable live load values at spans of 16 inches on center and 24 inches on center taken from referenced standard APA E30,APA Engineered Wood Construction Guide. Refer to
referenced standard for allowable spans not listed in the table.
For SI: 1 inch = 25.4 mm, 1 pound per square foot = 0.0479 kPa.
a. The allowable total loads were determined using a dead load of 10 psf. If the dead load exceeds 10 psf, then the live load shall be reduced accordingly.
b. Panels continuous over two or more spans with long dimension (strength axis) perpendicular to supports. Spans shall be limited to values shown because of possible effect of
concentrated loads.
c. Applies to panels 24 inches or wider.
d. Lumber blocking, panel edge clips (one midway between each support, except two equally spaced between supports where span is 48 inches), tongue-and-groove panel
edges, or other approved type of edge support.
e. Includes Structural I panels in these grades.
f. Uniform load deflection limitation:1/180 of span under live load plus dead load,1/240 of span under live load only.
g. Maximum span 24 inches for15/32- and1/2-inch panels.
h. Maximum span 24 inches where3/4-inch wood finish flooring is installed at right angles to joists.
i. Maximum span 24 inches where 1.5 inches of lightweight concrete or approved cellular concrete is placed over the subfloor.
j. Unsupported edges shall have tongue-and-groove joints or shall be supported with blocking unless minimum nominal1/4-inch-thick wood panel-type underlayment, fiber-
cement underlayment with end and edge joints offset not less than 2 inches or 11/2 inches of lightweight concrete or approved cellular concrete is placed over the subfloor, or
3/4-inch wood finish flooring is installed at right angles to the supports. Fiber-cement underlayment shall comply with ASTM C1288 or ISO 8336 Category C. Allowable uniform
live load at maximum span, based on deflection of1/360 of span, is 100 psf.
k. Unsupported edges shall have tongue-and-groove joints or shall be supported by blocking unless nominal1/4-inch-thick wood panel-type underlayment, fiber-cement under-
layment with end and edge joints offset not less than 2 inches or3/4-inch wood finish flooring is installed at right angles to the supports. Fiber-cement underlayment shall
comply with ASTM C1288 or ISO 8336 Category C. Allowable uniform live load at maximum span, based on deflection of1/360 of span, is 100 psf, except panels with a span rating
of 48 on center are limited to 65 psf total uniform load at maximum span.
l. Allowable live load values at spans of 16 inches on center and 24 inches on center taken from referenced standard APA E30,APA Engineered Wood Construction Guide. Refer to
referenced standard for allowable spans not listed in the table.
For SI: 1 inch = 25.4 mm, 1 pound per square foot = 0.0479 kPa.
a. The allowable total loads were determined using a dead load of 10 psf. If the dead load exceeds 10 psf, then the live load shall be reduced accordingly.
b. Panels continuous over two or more spans with long dimension (strength axis) perpendicular to supports. Spans shall be limited to values shown because of possible effect of
concentrated loads.
c. Applies to panels 24 inches or wider.
d. Lumber blocking, panel edge clips (one midway between each support, except two equally spaced between supports where span is 48 inches), tongue-and-groove panel
edges, or other approved type of edge support.
e. Includes Structural I panels in these grades.
f. Uniform load deflection limitation:1/180 of span under live load plus dead load,1/240 of span under live load only.
g. Maximum span 24 inches for15/32- and1/2-inch panels.
h. Maximum span 24 inches where3/4-inch wood finish flooring is installed at right angles to joists.
i. Maximum span 24 inches where 1.5 inches of lightweight concrete or approved cellular concrete is placed over the subfloor.
j. Unsupported edges shall have tongue-and-groove joints or shall be supported with blocking unless minimum nominal1/4-inch-thick wood panel-type underlayment, fiber-
cement underlayment with end and edge joints offset not less than 2 inches or 11/2 inches of lightweight concrete or approved cellular concrete is placed over the subfloor, or
3/4-inch wood finish flooring is installed at right angles to the supports. Fiber-cement underlayment shall comply with ASTM C1288 or ISO 8336 Category C. Allowable uniform
live load at maximum span, based on deflection of1/360 of span, is 100 psf.
k. Unsupported edges shall have tongue-and-groove joints or shall be supported by blocking unless nominal1/4-inch-thick wood panel-type underlayment, fiber-cement under-
layment with end and edge joints offset not less than 2 inches or3/4-inch wood finish flooring is installed at right angles to the supports. Fiber-cement underlayment shall
comply with ASTM C1288 or ISO 8336 Category C. Allowable uniform live load at maximum span, based on deflection of1/360 of span, is 100 psf, except panels with a span rating
of 48 on center are limited to 65 psf total uniform load at maximum span.
l. Allowable live load values at spans of 16 inches on center and 24 inches on center taken from referenced standard APA E30,APA Engineered Wood Construction Guide. Refer to
referenced standard for allowable spans not listed in the table.
For SI: 1 inch = 25.4 mm, 1 pound per square foot = 0.0479 kPa.
a. The allowable total loads were determined using a dead load of 10 psf. If the dead load exceeds 10 psf, then the live load shall be reduced accordingly.
b. Panels continuous over two or more spans with long dimension (strength axis) perpendicular to supports. Spans shall be limited to values shown because of possible effect of
concentrated loads.
c. Applies to panels 24 inches or wider.
d. Lumber blocking, panel edge clips (one midway between each support, except two equally spaced between supports where span is 48 inches), tongue-and-groove panel
edges, or other approved type of edge support.
e. Includes Structural I panels in these grades.
f. Uniform load deflection limitation:1/180 of span under live load plus dead load,1/240 of span under live load only.
g. Maximum span 24 inches for15/32- and1/2-inch panels.
h. Maximum span 24 inches where3/4-inch wood finish flooring is installed at right angles to joists.
i. Maximum span 24 inches where 1.5 inches of lightweight concrete or approved cellular concrete is placed over the subfloor.
j. Unsupported edges shall have tongue-and-groove joints or shall be supported with blocking unless minimum nominal1/4-inch-thick wood panel-type underlayment, fiber-
cement underlayment with end and edge joints offset not less than 2 inches or 11/2 inches of lightweight concrete or approved cellular concrete is placed over the subfloor, or
3/4-inch wood finish flooring is installed at right angles to the supports. Fiber-cement underlayment shall comply with ASTM C1288 or ISO 8336 Category C. Allowable uniform
live load at maximum span, based on deflection of1/360 of span, is 100 psf.
k. Unsupported edges shall have tongue-and-groove joints or shall be supported by blocking unless nominal1/4-inch-thick wood panel-type underlayment, fiber-cement under-
layment with end and edge joints offset not less than 2 inches or3/4-inch wood finish flooring is installed at right angles to the supports. Fiber-cement underlayment shall
comply with ASTM C1288 or ISO 8336 Category C. Allowable uniform live load at maximum span, based on deflection of1/360 of span, is 100 psf, except panels with a span rating
of 48 on center are limited to 65 psf total uniform load at maximum span.
l. Allowable live load values at spans of 16 inches on center and 24 inches on center taken from referenced standard APA E30,APA Engineered Wood Construction Guide. Refer to
referenced standard for allowable spans not listed in the table.
For SI: 1 inch = 25.4 mm, 1 pound per square foot = 0.0479 kPa.
a. The allowable total loads were determined using a dead load of 10 psf. If the dead load exceeds 10 psf, then the live load shall be reduced accordingly.
b. Panels continuous over two or more spans with long dimension (strength axis) perpendicular to supports. Spans shall be limited to values shown because of possible effect of
concentrated loads.
c. Applies to panels 24 inches or wider.
d. Lumber blocking, panel edge clips (one midway between each support, except two equally spaced between supports where span is 48 inches), tongue-and-groove panel
edges, or other approved type of edge support.
e. Includes Structural I panels in these grades.
f. Uniform load deflection limitation:1/180 of span under live load plus dead load,1/240 of span under live load only.
g. Maximum span 24 inches for15/32- and1/2-inch panels.
h. Maximum span 24 inches where3/4-inch wood finish flooring is installed at right angles to joists.
i. Maximum span 24 inches where 1.5 inches of lightweight concrete or approved cellular concrete is placed over the subfloor.
j. Unsupported edges shall have tongue-and-groove joints or shall be supported with blocking unless minimum nominal1/4-inch-thick wood panel-type underlayment, fiber-
cement underlayment with end and edge joints offset not less than 2 inches or 11/2 inches of lightweight concrete or approved cellular concrete is placed over the subfloor, or
3/4-inch wood finish flooring is installed at right angles to the supports. Fiber-cement underlayment shall comply with ASTM C1288 or ISO 8336 Category C. Allowable uniform
live load at maximum span, based on deflection of1/360 of span, is 100 psf.
k. Unsupported edges shall have tongue-and-groove joints or shall be supported by blocking unless nominal1/4-inch-thick wood panel-type underlayment, fiber-cement under-
layment with end and edge joints offset not less than 2 inches or3/4-inch wood finish flooring is installed at right angles to the supports. Fiber-cement underlayment shall
comply with ASTM C1288 or ISO 8336 Category C. Allowable uniform live load at maximum span, based on deflection of1/360 of span, is 100 psf, except panels with a span rating
of 48 on center are limited to 65 psf total uniform load at maximum span.
l. Allowable live load values at spans of 16 inches on center and 24 inches on center taken from referenced standard APA E30,APA Engineered Wood Construction Guide. Refer to
referenced standard for allowable spans not listed in the table.
For SI: 1 inch = 25.4 mm, 1 pound per square foot = 0.0479 kPa.
a. The allowable total loads were determined using a dead load of 10 psf. If the dead load exceeds 10 psf, then the live load shall be reduced accordingly.
b. Panels continuous over two or more spans with long dimension (strength axis) perpendicular to supports. Spans shall be limited to values shown because of possible effect of
concentrated loads.
c. Applies to panels 24 inches or wider.
d. Lumber blocking, panel edge clips (one midway between each support, except two equally spaced between supports where span is 48 inches), tongue-and-groove panel
edges, or other approved type of edge support.
e. Includes Structural I panels in these grades.
f. Uniform load deflection limitation:1/180 of span under live load plus dead load,1/240 of span under live load only.
g. Maximum span 24 inches for15/32- and1/2-inch panels.
h. Maximum span 24 inches where3/4-inch wood finish flooring is installed at right angles to joists.
i. Maximum span 24 inches where 1.5 inches of lightweight concrete or approved cellular concrete is placed over the subfloor.
j. Unsupported edges shall have tongue-and-groove joints or shall be supported with blocking unless minimum nominal1/4-inch-thick wood panel-type underlayment, fiber-
cement underlayment with end and edge joints offset not less than 2 inches or 11/2 inches of lightweight concrete or approved cellular concrete is placed over the subfloor, or
3/4-inch wood finish flooring is installed at right angles to the supports. Fiber-cement underlayment shall comply with ASTM C1288 or ISO 8336 Category C. Allowable uniform
live load at maximum span, based on deflection of1/360 of span, is 100 psf.
k. Unsupported edges shall have tongue-and-groove joints or shall be supported by blocking unless nominal1/4-inch-thick wood panel-type underlayment, fiber-cement under-
layment with end and edge joints offset not less than 2 inches or3/4-inch wood finish flooring is installed at right angles to the supports. Fiber-cement underlayment shall
comply with ASTM C1288 or ISO 8336 Category C. Allowable uniform live load at maximum span, based on deflection of1/360 of span, is 100 psf, except panels with a span rating
of 48 on center are limited to 65 psf total uniform load at maximum span.
l. Allowable live load values at spans of 16 inches on center and 24 inches on center taken from referenced standard APA E30,APA Engineered Wood Construction Guide. Refer to
referenced standard for allowable spans not listed in the table.
TABLE R503.2.1.1(2)—ALLOWABLE SPANS FOR SANDED PLYWOOD COMBINATION SUBFLOOR UNDERLAYMENTa Col2 Col3 Col4
--- --- --- ---
** IDENTIFICATION** ** SPACING OF JOISTS**
(inches)
** SPACING OF JOISTS**
(inches)
** SPACING OF JOISTS**
(inches)
** IDENTIFICATION** ** 16** ** 20** ** 24**
Species groupb
1 1/2 5/8 3/4
2, 3 5/8 3/4 7/8
4 3/4 7/8 1
For SI: 1 inch = 25.4 mm, 1 pound per square foot = 0.0479 kPa.
a. Plywood continuous over two or more spans and face grain perpendicular to supports. Unsupported edges shall be tongue-and-groove or blocked except where nominal1/4-
inch-thick wood panel-type underlayment, fiber-cement underlayment or3/4-inch wood finish floor is used. Fiber-cement underlayment shall comply with ASTM C1288 or ISO
8336 Category C. Allowable uniform live load at maximum span based on deflection of1/360 of span is 100 psf.
b. Applicable to all grades of sanded exterior-type plywood.
For SI: 1 inch = 25.4 mm, 1 pound per square foot = 0.0479 kPa.
a. Plywood continuous over two or more spans and face grain perpendicular to supports. Unsupported edges shall be tongue-and-groove or blocked except where nominal1/4-
inch-thick wood panel-type underlayment, fiber-cement underlayment or3/4-inch wood finish floor is used. Fiber-cement underlayment shall comply with ASTM C1288 or ISO
8336 Category C. Allowable uniform live load at maximum span based on deflection of1/360 of span is 100 psf.
b. Applicable to all grades of sanded exterior-type plywood.
For SI: 1 inch = 25.4 mm, 1 pound per square foot = 0.0479 kPa.
a. Plywood continuous over two or more spans and face grain perpendicular to supports. Unsupported edges shall be tongue-and-groove or blocked except where nominal1/4-
inch-thick wood panel-type underlayment, fiber-cement underlayment or3/4-inch wood finish floor is used. Fiber-cement underlayment shall comply with ASTM C1288 or ISO
8336 Category C. Allowable uniform live load at maximum span based on deflection of1/360 of span is 100 psf.
b. Applicable to all grades of sanded exterior-type plywood.
For SI: 1 inch = 25.4 mm, 1 pound per square foot = 0.0479 kPa.
a. Plywood continuous over two or more spans and face grain perpendicular to supports. Unsupported edges shall be tongue-and-groove or blocked except where nominal1/4-
inch-thick wood panel-type underlayment, fiber-cement underlayment or3/4-inch wood finish floor is used. Fiber-cement underlayment shall comply with ASTM C1288 or ISO
8336 Category C. Allowable uniform live load at maximum span based on deflection of1/360 of span is 100 psf.
b. Applicable to all grades of sanded exterior-type plywood.

el 18 de julio de 2025 11:14 AM (CDT) BAJO ELLO.

PISOS

R503.2.2 Luz máxima permitida. La luz máxima permitida para paneles estructurales de madera usados como subsuelo o subsuelo combinado con capa de base será la establecida en la Tabla R503.2.1.1(1), o APA E30. La luz máxima para contrachapado lijado combinado como subsuelo con capa de base será la establecida en la Tabla R503.2.1.1(2).

R503.2.3 Instalación. Los paneles estructurales de madera usados como subsuelo o subsuelo combinado con capa de base deberán fijarse a la estructura de madera conforme a la Tabla R602.3(1) y deberán fijarse a la estructura de acero conformado en frío conforme a la Tabla R505.3.1(2).

R503.3 Tablero de partículas.

R503.3 Tablero de partículas.

R503.3.1 Identificación y grado. El tablero de partículas deberá cumplir con ANSI A208.1 y deberá estar identificado mediante una marca de grado o un certificado de inspección emitido por una agencia aprobada.
R503.3.2 Subsuelo para pisos. El subsuelo para pisos de tablero de partículas deberá cumplir con el Tipo PBU y tener un espesor no menor de [1] / 4 pulgada (6.4 mm).

R503.3.3 Instalación. El subsuelo de tablero de partículas deberá instalarse de acuerdo con las recomendaciones del fabricante y fijarse a la estructura conforme a la Tabla R602.3(1).

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